package com.github.HarryHook.coding2017.stack.expr;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class Token {
    public static final List<String> OPERATORS = Arrays.asList("+", "-", "*", "/");
    private static final Map<String, Integer> priorities = new HashMap<>();
    static {
	priorities.put("+", 1);
	priorities.put("-", 1);
	priorities.put("*", 2);
	priorities.put("/", 2);
    }
    static final int OPERATOR = 1;
    static final int NUMBER = 2;
    String value;
    int type;

    public Token(int type, String value) {
	this.type = type;
	this.value = value;
    }

    public boolean isNumber() {
	return type == NUMBER;
    }

    public boolean isOperator() {
	return type == OPERATOR;
    }

    public int getIntValue() {
	return Integer.valueOf(value).intValue();
    }

    public String toString() {
	return value;
    }

    public boolean hasHigherPriority(Token t) {
	if (!this.isOperator() && !t.isOperator()) {
	    throw new RuntimeException("numbers can't compare priority");
	}
	return priorities.get(this.value) - priorities.get(t.value) > 0;
    }

}